System and Method for Providing Related Content at Low Power, and Computer Readable Recording Medium Having Program Recorded Therein

1. A method for providing a related content in a mobile receiver which comprises a memory, a processor, a microphone to detect a sound outputted from a content playing device which plays a main content, and an ADC to convert the sound detected by the microphone into digital data, the method comprising: extracting a non-audible sound wave ID from the digital data; displaying a related content corresponding to the sound wave ID as an image and/or voice; activating at least one element of elements performing the extracting and the displaying; and storing a sound wave ID schedule indicating times at which the sound wave ID is extractable, wherein the sound wave ID is digital data indicating a non-audible sound which is artificially inserted into the sound outputted from the content playing device, or an audible fingerprint ID indicating a characteristic of a sound which is extracted from a sound included as a part of the sound outputted from the content playing device, and wherein the activating is performed at the time at which the sound wave ID is extractable with reference to the sound wave ID schedule.

2. The method of claim 1 , wherein the related content refers to information of a sound, an image, a document, and an Internet address related to details of a main content or background knowledge for delivering the details, and/or a digital identifier value indicating said information.

3. The method of claim 2 , wherein the sound wave ID is used to identify the related content, and is used to (1) identify the main content, (2) identify a relative time location within the main content, or (3) identify a related content related to an advertisement at the relative time location within the main content.

4. The method of claim 3 , further comprising: transmitting the sound wave ID to a server; and receiving the related content corresponding to the sound wave ID from the mobile receiver.

5. The method of claim 1 , further comprising: determining whether the detected sound has an intensity greater than or equal to a predetermined threshold; and when it is determined that the sound has the intensity greater than or equal to the predetermined threshold, activating the ADC and an element which performs the extracting of the sound wave ID, such that the elements operate.

6. The method of claim 5 , wherein an element which performs the determining is activated when the microphone detects a sound belonging to a predetermined band, and wherein the ADC and the element which performs the extracting of the sound wave ID are activated simultaneously or in sequence when it is determined that the sound has the intensity greater than or equal to the predetermined threshold.

7. The method of claim 1 , further comprising: activating at least one element of elements which performs the extracting and the displaying, according to a schedule or when a predetermined event occurs.

8. The method of claim 7 , wherein an element activated by the activating is the microphone, the ADC, and an element which performs the extracting of the sound wave ID.

10. The method of claim 7 , wherein the activating is performed periodically, and is not performed when a predetermined event occurs at time at which the activating is scheduled to be performed.

11. The method of claim 7 , wherein the activating is performed in a first period, and, when the extraction of the sound wave ID fails as a result of performing the extracting of the sound wave ID, but it is determined that there is the sound wave ID, is performed in a second period which is shorter than the first period.

12. The method of claim 7 , wherein the event refers to the predetermined event in which a specific application is executed, an event in which a display unit provided in the mobile receiver is activated or inactivated, or an event in which the mobile receiver receives a push message.

13. The method of claim 7 , wherein the predetermined event is an event in which an application using a microphone for its own use is executed.

14. The method of claim 7 , comprising: when the predetermined event occurs, delivering occurrence of the event to an operating system; delivering, by the operating system, the occurrence of the predetermined event to filters which are provided to correspond to applications operating in the mobile receiver; and delivering or refraining from delivering, by the filters, the occurrence of the predetermined event to the applications corresponding thereto according to predetermined settings.

15. The method of claim 1 , wherein the ADC and an element which performs the extracting of the sound wave ID are activated simultaneously or in sequence when the microphone detects a sound belonging to a predetermined band.

16. The method of claim 15 , further comprising: selecting the related content, and wherein an element which performs the selecting of the related content, and an element which performs the displaying of the related content as the image and/or the voice are activated simultaneously and in sequence when the sound wave ID is extracted from the digital data.

17. A method for providing a related content in a mobile receiver which comprises a memory, a processor, a microphone to detect a sound outputted from a content playing device which plays a main content, and an ADC to convert the sound detected by the microphone into digital data, the method comprising: extracting a non-audible sound wave ID from the digital data; displaying a related content corresponding to the sound wave ID as an image and/or voice; activating at least one element of elements which performs the extracting and the displaying; and storing a main content schedule indicating times at which the main content is played, wherein the sound wave ID is digital data indicating a non-audible sound which is artificially inserted into the sound outputted from the content playing device, or an audible fingerprint ID indicating a characteristic of a sound which is extracted from a sound included as a part of the sound outputted from the content playing device, and wherein the activating is performed according to the time at which the main content is played with reference to the main content schedule.

18. The method of claim 17 , wherein the activating is performed in a predetermined period during the time that the main content is played.

19. The method of claim 17 , wherein the activating is performed in a first period during the time that the main content is played, and is performed in a second period which is longer than the first period during the time that the main content is not played.